Bag

Abstract

A collapsible bag is provided for receiving and discharging fluids, pastes, or gases, and contains at least one composite film with a rough internal layer. The bag due to the roughened internal layer is specifically configured such that the inner walls of the bag will not stick to each other.

1 . A flexible bag, comprising:
 at least one film for receiving and discharging fluids, pastes, or gases, said film having a roughened internal side being at least one of partially roughened or completely roughened.   
     
     
         2 . The bag according to  claim 1 , further comprising a further film, said roughened internal side is completely congruent with said further film and is opposite said further film. 
     
     
         3 . The bag according to  claim 1 , wherein said roughened internal side of said film contains at least one polymer and at least one surface-roughening additive. 
     
     
         4 . The bag according to  claim 3 , wherein said surface-roughening additive is selected from the group consisting of a mineral, an inorganic substance, of an organic nature, and a mixture thereof, said surface-roughening additive does not melt together with said film. 
     
     
         5 . The bag according to  claim 1 , wherein said at least one film is formed from a flexible plastic. 
     
     
         6 . The bag according to  claim 1 , wherein said film is one of at least two opposite disposed free film plies welded at edges to each other. 
     
     
         7 . The bag according to  claim 1 , wherein said at least one film has been produced by co-extrusion. 
     
     
         8 . The bag according to  claim 1 , wherein said at least one film has been produced from a laminated film. 
     
     
         9 . The bag according to  claim 5 , wherein said flexible plastic is selected from the group consisting of PVC, silicones, PET, PA, POP, PP, PE, ULDPE, VLDPE, LLDPE, mLLDPE, LDPE, MDPE, HDPE, EVA, EBA, EAA, EMA, EMAA, ionomers, a mixture thereof and a copolymer thereof. 
     
     
         10 . The bag according to  claim 3 , wherein said surface-roughening additive is selected from the group consisting of sand, clay, silica, quartz, silicic acids, kieselguhr, silicates, cross-linked polymers, UHMWP, heat-resistant polymers and a mixture thereof. 
     
     
         11 . A flexible bag, comprising:
 at least one film filled with a solids content and further gas filled, said film having a roughened internal side being at least one of partially roughened or completely roughened.   
     
     
         12 . The bag according to  claim 11 , further comprising a further film, said roughened internal side is completely congruent with said further film and is opposite said further film. 
     
     
         13 . The bag according to  claim 11 , wherein said roughened internal side of said film contains at least one polymer and at least one surface-roughening additive. 
     
     
         14 . The bag according to  claim 13 , wherein said surface-roughening additive is selected from the group consisting of a mineral, an inorganic substance, of an organic nature, and a mixture thereof, said surface-roughening additive does not melt together with said film. 
     
     
         15 . The bag according to  claim 11 , wherein said at least one film is formed from a flexible plastic. 
     
     
         16 . The bag according to  claim 11 , wherein said film is one of at least two opposite disposed free film plies welded at edges to each other. 
     
     
         17 . The bag according to  claim 11 , wherein said at least one film has been produced by co-extrusion. 
     
     
         18 . The bag according to  claim 11 , wherein said at least one film has been produced from a laminated film. 
     
     
         19 . The bag according to  claim 15 , wherein said flexible plastic is selected from the group consisting of PVC, silicones, PET, PA, POP, PP, PE, ULDPE, VLDPE, LLDPE, mLLDPE, LDPE, MDPE, HDPE, EVA, EBA, EAA, EMA, EMAA, ionomers, a mixture thereof and a copolymer thereof. 
     
     
         20 . The bag according to  claim 13 , wherein said surface-roughening additive is selected from the group consisting of sand, clay, silica, quartz, silicic acids, kieselguhr, silicates, cross-linked polymers, UHMWP, heat-resistant polymers and a mixture thereof.